#!/bin/bash

#shell脚本的默认变量

echo "The script name is ==> $0"

[ -n "$1" ] && echo "The 1st parameter ==> $1" || exit 0
[ -n "$2" ] && echo "The 2nd parameter ==> $2" || exit 0
[ -n "$3" ] && echo "The 3th parameter ==> $3" || exit 0
